BigRIPS 及び BigRIPS検出器

理化学研究所原子核研究技術開発グループ
BigRIPS 開発チーム
大西哲哉

1: Introduction
Particle identification of RI beam
•We can select nuclei of interest.
•Experiment with several nucleus
can be done at same time.

Bρ-ΔE-TOF method
Bρ
TOF
ΔE

Position detector
Timing detector
Energy loss detector

Z≠Q More information: E

A/Q, PZABigRIPS & ZDS

Tagging

Production andSeparation
DegraderZDS

BigRIPS
TargetDipolesD5
D4

Normal Conducting
H-Shaped Sector
Bending Radius
Bending Angle
Pole Gap
Max. Field
Max. Current
Current Density
Turn/CoilWeight6m30 degree
140 mm
1.6 T
1000 A
5.6 A/mm2
10060 Ton

D6D3Target

D2
D1 Beam Dump

D3-D4 in BigRIPS Hall

D1 - Almina Cement Insulated Coil

Quadrupoles

STQ14
STQ11Superconducting
Triplet in Single Cryostat
Hexapole superimposed

STQ6
STQ5
STQ1

Air-Core
P2
P1

STQ2

P3

Cryostat with
Cryocoolers

Q800/1000
Q500

Q500

BigRIPS Hall
Cryostat cooled by
Cryogenic plant
BigRIPS Cave

SuperferricF3

F5PlasticIC

PPAC(800mm)

PPAC(890mm)

Target

Plastic
F7PlasticIC

PPAC(950mm)

Bρ-ΔE-TOF method
Bρ PPAC
ΔE Ion chamber, Si
TOF PlasticTOF Plastic

Reaction Target

X,Y,θ,φPPACx2 ΔE IC, SiBρ PPACx2

Transmission method

TOF Plastic

ΔE IC, SiReaction Target(PPACx2)

ΔE IC, SiBρPPACx2
X,Y,θ,φTOF

Plastic

Reaction Target

PPACx2
X,Y,θ,φΔE

Bρ

IC, Si

PPACx2ΔE IC, SiBρPPACx2

2: Detectors

Position detector: PPACDL-PPAC: Delay Line Parallel Plate Avalanche Counter
H. Kumagai et al., Nucl. Instr. and Meth. A470(2001)562.

Gas: C3F8 10～30 Torr
HV: 800 ～1800 V
Anode,Cathode:2 μm Mylar
Window:
4～12 μm Al-Mylar

PPAC has been already used in RIPS.
Counting rate: ～106 Hz

Performance Test for heavy nuclei at high energy
132Xe @400MeV/A at HIMAC

Tsum=X1+X2Resolution
Position σ= 0.27 mm(r.m.s)
Timing σ= 0.1 ns(r.m.s)

DL-PPAC for BigRIPS

Anode

Effective area: 240 mm x 150 mm

CathodeTo avoid the effect of δ-ray,
we set the double layer.
High efficiency

ΔE detector: Ion chamber
TEGIC

K. Kimura et al., Nucl. Instr. and Meth. A538(2005)608

Acceptance: φ90,200 mm

Beam

Drift length : 2 cm
Anode: 12
Electrode : 4 μm Mylar Cathode: 13
Tilted angle : 30°
Window :50μm Capton•Short drift length for high counting rate.
•Stacked structure for large signal.
•Tilted electrodes to avoid the effect of recombination.

φ90 mm

φ200 mm

243mm

Performance test
RIKEN E1C
56Fe at 90MeV/A

φ90 mm
HV:500V, P-10:740 Torr

A/Z =2
Z=20

ToF: Plastic

Z=26

ΔE/E ～ < 2%(FWHM)

Performance for heavy ion at high energy
86Kr

132Xe 400MeV/A: HIMAC
400MeV/A: HIMAC
800MeV/A: GSI (φ200 mm)

ΔE Resolution of TEGIC]%[)M
HWF(GSIRIKEN

HIMAC

Rate dependence

Ar+CF4(90:10)

P-10

Rate: 106 Hz

Development of circuit

3: Readout system
Signal transport system with optical fiber
FiberDetector

Transmitter

ReceiverCircuits•We can transport with long distance (>100m)•The electric ground level of the detector
is isolated from that of the counting room
•It is easy to add a long delay time.

Transmitter

ReceiverPhoto diode100 m Coaxial cable

outputinput

output
PPAC

input

NIM

100 m fiber cable

outputPPAC
input

outputinput

NIM

Fast signalNoiseLinearity−5Vo = −2.066 + 1.0045 × Vi + 3.826 ×10 VioVVi2

4: DAQ
Requirement and Condition•Analog signal can be transported with optical fiber.
•The total number of channel at a time
is not so much. (～ 50 ch)•It is required that
assets of CAMAC modules are applied.
•Network based DAQ system is required
to combine with User’s DAQ system
Network based CAMAC DAQ system with CC/NETCC/NET
Pipe line CAMAC controller
with PC104plus single board computer
1 CAMAC access : 1 μsec + (40 nsec overhead)This module has been developed by KEK online group.

PPACPlastic

Counting room

User Trigger

Fiber
Trigger

ADC,TDC

CC/NETTriggerExp. room

NetworkAnalog
NetworkIC,Si

ADC,TDC

CC/NETPC

User Trigger
BigRIPSUser

ADC,TDC

CC/NETTrigger

User’s DAQ System

Network
Network

Z,A(Bρ,ΔE,TOF)

Network
CC/NETPC

Other information
PPAC HV, Plastic HV(CAEN)Counter Gas
Si HV(Mesytec)

Magnet etc…
EPICS Server

Control
Control

DB Server

DAQ, Client

Web

User system

5: Summary
Detectors: PPAC, IC
Proto-type detectors have been developed.
Construction and development are going on.

Readout system
Signal transport system with optical fiberhas been developed.

DAQ system: CC/NETThe proto-type system is under construction.

All detectors and DAQ system
are scheduled to be ready at Autumn 2006.